Oulipo Header Image prob in IE and Firefox

If you view the new blog i am setting up http://ryanjz.wordpress.com in Chrome the header image is perfect. If you open the blog in IE8 or Firefox 3 and 4 beta the header image is 2px taller and obscures the dotted line.

Any tips on correcting this? I have already triend several images including pre-cropped 712x80 originals. If i submit a 78px height it stretches the image and the result is the same.

Hi ryanjz, thanks for your report on this. It appears that with your theme, Oulipo, the header gets pushed down when you're logged into WordPress.com (if you visited the site in Chrome and were logged out that could explain why it looks OK there). We'll take a look and get it fixed.